I started thinking about this last night and came to the same conclusion as OP: the new set should probably focus on stealth and traps. To that end, I thought about what I would want from it and came up with the following:
- 2p: Smoke Screen gains the effect of the Displacement rune and lasts until you deal or take damage.
- 4p: Preparation gains the effect of the Punishment rune and detonates your deployed Spike Traps. You gain 60% damage reduction for 30 seconds after using Preparation.
- 6p: Spike Traps deal 20000% more damage and reduce the cooldown on Preparation by 3 seconds when detonated.
Additionally, the following legendary items are changed:
- Demon’s Demise: Your Spike Traps deal 300-400% increased damage and damage enemies again 1 second later.
- Chanon Bolter: Your Spike Traps lure enemies and deal 300-400% increased damage. Enemies can be taunted every 12-16 seconds.
- Trag’Oul Coils: Your Spike Traps deal 200-300% more damage, gain the Impaling Spines rune, and deploy twice as fast.
This combines to give Spike Traps roughly equivalent damage to Heaven’s Fury using Crusader’s Valor set build. The playstyle would be very different from anything else in the game though.
- use Smoke Screen to turn invis
- lay out Spike Traps while invis
- retreat, Spike Traps lure enemies close
- mark areas around traps with Marked for Death: Valley of Death
- drop Caltrops: Bait the Trap
- activate Preparation to recover discipline and hatred and detonate your Spike Traps
Additionally, I wanted to try and add some new legendary effects to enable zdps support DH builds:
- Odyssey’s End: Enemies hit by Entangling Shot take 25-50% increased damage from all sources for 6 seconds. This effect’s duration refreshes for all targets whenever you hit with Entangling Shot.
- Enimei’s Duffel: Bolas explode instantly and drop Caltrops on hit
- Leonine Bow of Hashir: Bolas pull in all enemies within 24 yards.
- New Ring: All allies within 50 yards gain the benefit of Shadow Power while it is active.
- New Amulet: When you hit an enemy you grant all allies within 50 yards a protective shield equal to 80-100% your Life on Hit that lasts 4 seconds. This shielding effect stacks up to a total of 100% your maximum Life. Each time this effect stacks the duration is refreshed.
This is just some random thoughts from someone with very little experience with DH, I hope they spark some ideas in others.